Having triggered the Kajang by-election through the resignation of incumbent Lee Chin Cheh, the likelihood of a low voter turnout tomorrow is now plaguing the PKR camp.

"We are cautiously optimistic that people will come back... Turnout is crucial and I urge everyone to come back home to vote. If you love Kajang, come back and make a decision," PKR's Bayan Baru MP Sim Tze Tsin said in an impassioned appeal.